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(11)

EP 1 730 324 A1

(12)

(43) Date of publication: 13.12.2006 Bulletin 2006/50 (21) Application number: 04724711.9 (22) Date of filing: 31.03.2004

(51) International Patent Classification (IPC):  C23F 1/46(2006.01) B21C 35/06(2006.01) (86) International application number: PCT/IT2004/000167 (87) International publication number: WO 2005/095674 (13.10.2005 Gazette 2005/41)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR (71) Applicant: G. R. Trattamenti Termici - GRTT S.R.L. 04014 Frazione Fossanova-Pontinia (IT)	(72) Inventors: RICCIARINI, Silvia I-00147 Roma (IT) COLELLA, Carmine I-80070 Pozzuoli (IT) CAPUTO, Domenico I-84012 Angri (IT) DE GENNARO, Bruno I-80129 Napoli (IT) (74) Representative: Sarpi, Maurizio  Studio FERRARIO Via Collina, 36 I-00187 Roma I-00187 Roma (IT)